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Method for producing a heat insulating material composed of a hydrophobic aerogel and the application thereof

a technology of hydrophobic aerogel and heat insulating material, which is applied in the direction of heat-proofing, colloidal chemistry, and silica compounds, etc., can solve the problems of large amount of odor or smoke, high cost, and high risk of loose powder during use, so as to reduce overall production time, enhance aerogel strength, and achieve the effect of appropriate strength and flexibility

Pending Publication Date: 2021-10-28
TAIWAN AEROGEL TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to overcome the issue of high cost and time-consuming production processes using solvent replacement or washing. Instead, the invention proposes a simple and economic effective process for producing silicone aerogel material. The process requires only hydrolysis and condensation reaction steps during production, and does not require solvent replacement or washing. The resulting aerogel product can be obtained by simply aging under high temperature and then drying under normal pressure and temperature.

Problems solved by technology

An objective of the present invention is to overcome the problem of existing production process using solvent replacement or washing condition such that it is not cost effective due to its overly high cost and overly time-consuming process.
In particular, a known aerogel heat insulating blanket mainly uses aerogel powder and inorganic fiber or organic fiber intertwined with each other; therefore, the structure is fluffy, and the aerogel cannot be bonded tightly with the inorganic fiber or the organic fiber, such that it is extremely likely to generate loose powder during use.
Consequently, large amount of odor or smoke is generated.

Method used

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  • Method for producing a heat insulating material composed of a hydrophobic aerogel and the application thereof
  • Method for producing a heat insulating material composed of a hydrophobic aerogel and the application thereof
  • Method for producing a heat insulating material composed of a hydrophobic aerogel and the application thereof

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first embodiment

[0047]Please refer to FIG. 1, a method for producing a heat insulating material composed of an inorganic binder and aerogel according to the present invention is shown, comprising the following steps of: mixing step (S11), hydrolysis step (S12), condensation step (S13), aging step (S14), and drying step (S15), thereby to produce a heat insulating board or brick composed of a hydrophobic aerogel, the board or brick having the properties of high strength, without loose powder, resistant to low temperature and cold resisting.

[0048]Mixing step (S11): mixing one or a plurality of an alkoxysilane compound, an olefin alkoxysilane compound and R group-silicone oligo molecules or any mixture thereof with a small amount of inorganic binder solution, a small amount of halogen-ion-free surfactant and a mixing solvent together to form a mixing solution. The alkoxysilane compound is, such as, tetramethoxysilane (TMOS) or tetraethoxysilane (TEOS); the olefin alkoxysilane compound is, such as, meth...

second embodiment

[0055]Please refer to FIG. 2, a method for producing a heat insulating material composed of an inorganic binder and aerogel according to the present invention is shown, which comprises the following steps of: mixing step (S21), hydrolysis step (S22), condensation step (S23), composition step (S24), aging step (S25), and drying step (S26), thereby to produce a heat insulating blanket composed of a hydrophobic aerogel and inorganic fiber, a blanket composed of aerogel and organic fiber or a foam pad composed of aerogel and organic material, having the properties of high strength, without loose powder, resistant to low temperature and cold resisting.

[0056]Mixing step (S21): mixing one or a plurality of an alkoxysilane compound, an olefin alkoxysilane compound and R group-silicone oligo molecules or any mixture thereof with a small amount of inorganic binder solution, a small amount of halogen-ion-free surfactant and a mixing solvent together to form a mixing solution. The alkoxysilane ...

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Abstract

The invention provides a method for producing a heat insulating material composed of a hydrophobic aerogel, and the method includes the steps of: (1) mixing step; (2) hydrolysis step; (3) condensation step; (4) aging step; and (5) drying step. In the method, a siloxane compound, an inorganic gel, and a halogen-free surfactant are mixed and then a sol-gel process is performed to produce the aerogel heat-insulating material without water-washing. The produced heat-insulating material has preferable strength, smooth appearance, and low shrinkage and can overcome the powder-dropping problem. By the provided method, an aerogel heat-insulating board can be produced, or an aerogel cold-resisting and heat-insulating blanket can be produced by mixing with a fiber or a foam material.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method for producing a heat insulating material composed of a hydrophobic aerogel, and particularly to a quick production method for a heat insulating material composed of a hydrophobic aerogel having the properties of low temperature heat insulating and water repellent.BACKGROUND OF THE INVENTION[0002]Aerogel refers to a porous high-tech material having a geometrical network structure, and it has the characteristics of low density (0.003 to 0.2 g / cm3), high specific area (500-2,000 m2 / g) and low thermal conductivity (0.02 to 0.036 w / mK). The porosity of aerogel reaches above 95% and its internal contains a great amount of air; therefore, it has an overall transparent appearance and the characteristics of low thermal conductivity coefficient, low acoustic transmission speed and low dielectric constant, making aerogel as a material with the properties of excellent heat insulation, soundproof, electrical insulation, high a...

Claims

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Application Information

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IPC IPC(8): E04B1/78B01J13/00
CPCE04B1/78B01J13/0091B01J13/0069B01J13/0065B01J13/0056C01B33/157C01B33/1585
Inventor CHEN, JEAN-HONGCHEN, SHIU-SHIUPONG, SHENG-HONG
Owner TAIWAN AEROGEL TECH MATERIAL CO LTD
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